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According to Smaato, a mobile ad optimization and advertising company, Internet users on Symbian phones, feature phones and Windows Mobile phones are far more likely to click on mobile ads than users on iPhones, Android phones, Palm devices and Blackberries. To get this data, Smaato, analyzed over 4 billion ad requests on 36 mobile ad networks. Worldwide, the click-through rate (CTR) for Android users declined markedly over the last two month. While Android still had an above-average CTR in January (just behind Symbian), Android ranked at the bottom of Smaato's ranking for March.

Dusty Reagan, who runs the Twitter app FriendOrFollow, recently launched a new Twitter ad network called FeaturedUsers. Before you moan and groan about how Twitter is becoming too commercialized, listen up: this ad network isn't about splicing ads into your Twitter stream. Instead, it takes a page from Twitter's own "Recommended Users" section which is shown to new users upon sign-up. The difference is that the FeaturedUsers ad network serves up recommendations across Twitter's ecosystem of affiliate applications, including of course FriendOrFollow, but also on nearly twenty other sites like Twitdom, TwtBase, FollowCost, DoesFollow, and more. And more apps are waiting to sign up because FeaturedUsers is actually helping Twitter app developers make money.